Hi,

Two points :

1) i'am adding my own css classes in the default/app.css juste after the
Code:
@import url('../../../../../../../../lib/ext/resources/css/ext-all.css');
which now looks like :
Code:
@import url('../../../../../../../../lib/ext/resources/css/ext-all.css');
.header-panel {
	height				: 80px;	
	vertical-align 		: middle;
	text-align 			: center;	
	background			: #1272a2;
	background-image	: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #60c0e8), color-stop(100%, #1272a2));
	background-image	: -webkit-linear-gradient(top, #60c0e8,#1272a2);
	background-image	: -moz-linear-gradient(top, #60c0e8,#1272a2);
	background-image	: -o-linear-gradient(top, #60c0e8,#1272a2);
	background-image	: -ms-linear-gradient(top, #60c0e8,#1272a2);
	background-image	: linear-gradient(top, #60c0e8,#1272a2);
	background-repeat	: no-repeat;	
	color 				: #fff;
	text-shadow			: 0 -1px 0 rgba(0, 0, 0, .4);	
	border-bottom		: 1px solid #3a3a3a;
}
.../...
When i'am build the application (using sencha app build) the app.css is overriden and only the sencha css is included (all of my own definitions are removed)

2) Some of the images are not well pointed and give me a 404 http error with the build :

http://xx.xx.xx.xx:yy/Users/tag-all/Workspace/www/project/lib/ext/resources/themes/images/default/form/trigger.gif